Massachusetts Institute of Technology Department of Physics 8.962 Spring 2006 Problem Set 1: CLARIFICATION Problem 2 of pset 1 begins as follows: � and D � have the components 2. In some reference frame, the vector fields U √ . U α = (1 + t2 , t2 , 2t, 0) √ . Dα = (x, 5tx, 2t, 0) . The scalar ρ has the value ρ = x2 + t2 − y 2 . . (The relationship “LHS = RHS” means “the object on the left-hand side is represented by the object on the right-hand side in the specified reference frame.”) Clarification: The quantities t, x, and y in these vectors are just the usual Cartesian coor­ dinates in the specified reference frame.